Experimental measurement and analytical determination of shot peening residual stresses considering friction and real unloading behavior

Sherafatnia, K.; Farrahi, G.H.; Mahmoudi, A.H.; Ghasemi, Ali

doi:10.1016/j.msea.2016.01.070

Cited by 43 publications

(14 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…E p /E L is satisfied for each simulation at the various shot velocities in Table 5, except for velocities 75 m/s and 100 m/s, where the deviations from the lower limit are within acceptable value of 5 percent reported and referenced by Sherafatnia et al [38], and it has been highlighted in previous sections of this paper that 80 percent to 90 percent of energy lost by the shot is used for plastic deformation. Figure 5 is generated from these tables, with an indication of a reduction in the kinematic CoR as the impact velocity increases.…”

Section: Numerical Results and Discussionsupporting

confidence: 62%

“…The use of 0.8 in Equation 7is justified considering the fractional kinetic energy loss λ = 1 − k, where k is the efficiency coefficient related to the elastic and thermal dissipation in a purely elastic impact. This efficiency coefficient is from the findings of J. Reed, which were reported and referenced by Sherafatnia et al [38]. Reed stated that k is given a constant value of 0.8 in most works reported in the literature, and also observed that a portion of the energy induced into the workpiece by the shot in purely elastic impact is dissipated as radiation of elastic waves and cannot be recovered.…”

Section: Cor Calculations For Single-shot Impact In Demmentioning

confidence: 64%

See 1 more Smart Citation

A Numerical Investigation of a Single-Shot in a DEM-FEM Approach to Shot Peening Simulation

Edward

Heyns

Kok

2019

Metals

View full text Add to dashboard Cite

Shot peening (SP) is a controlled and systematic process of surface treatment that has a large number of controllable process parameters that make its application highly challenging. It involves the shooting of small and hard metallic balls at a targeted surface, with the aim of enhancing the fatigue strength of the workpiece under unfavorable service conditions. The compressive residual stress (CRS) induced by this application is expensive to evaluate experimentally. This paper presents a numerical model of the impact of a single-shot on a metallic surface, with the aim to set the stage for a realistic multiple shots peening simulation. The approach proposed herein is a sequential Discrete Element-Finite Element (DE-FE) coupled simulation, based on the use of different types of coefficients of restitution (CoRs) with emphasis on the energetic CoR. The energetic CoR relates the shot/target contact forces to the fractional strain energy needed for localized plastic deformation of the near-surface layer in the workpiece. The generated results of the induced compressive residual stresses (CRS) and equivalent plastic strain (PEEQ) from single-shot simulations are validated with similar results from the literature. Our study clarifies the strain energy aspects of a single-shot impact responsible for the desired effects of CRS and PEEQ, thereby laying the groundwork for accurate and realistic modeling of the SP process via the DEM-FEM approach.

show abstract

Section: Numerical Results and Discussionsupporting

confidence: 62%

Section: Cor Calculations For Single-shot Impact In Demmentioning

confidence: 64%

A Numerical Investigation of a Single-Shot in a DEM-FEM Approach to Shot Peening Simulation

Edward

Heyns

Kok

2019

Metals

View full text Add to dashboard Cite

show abstract

“…Han et al 81 and Meguid et al 32 initially doubted the suitability of Coulomb's friction and subsequently proposed a modification to it which was done by Han et al 81 by taking relative movement in the contact area prior to slip into consideration. This kind of slip was also considered by Sherafatnia et al 82 when evaluating the effects of friction on residual stresses; and moreover, the mechanism of sliding was described in detail in this investigation. It was found that the effect of friction was dominant on the distribution of residual stresses in surface layers, and that the surface residual stresses decreased, while the maximum residual stresses increased partially as the coefficient of Coulomb's friction increased.…”

Section: Target Materialssupporting

confidence: 52%

Literature review of numerical simulation and optimisation of the shot peening process

Chen

Desai

Heyns

et al. 2019

Advances in Mechanical Engineering

View full text Add to dashboard Cite

This work provides a comprehensive review of numerical simulation and optimisation of the shot peening found in the existing literature over the past 10 years. The review found that the developed numerical models coupling finite elements with discrete elements became increasingly mature and showed their advantages in incorporating flow behaviour and randomness of shots. High emphasis must be placed on the constitutive equations of target material where its strain-rate sensitivity, cyclic behaviour and Bauschinger effects are recommended to be incorporated in the numerical material model simultaneously since considering one of them in isolation may lead to unreliable distribution of residual stresses. Furthermore, material hardening is a critical benefit of shot peening; however, it has not received its deserved attention from the existing investigations, neither in simulation nor in optimisation. The study found that intensity and coverage are two critical control parameters recommended to be constraints for optimisation of shot peening. Finally, this work also found that developed heuristic algorithms, such as genetic algorithms have recently showed their advantages for searching optimal combinations of peening parameters. It is plausible that in the near future, the synergy of combining these algorithms with approximation models can be expected to gain more attention by researchers.

show abstract

“…Numerous analytical models and numerical approaches based on finite element analysis have been developed to simulate the shot peening process and determine the relationships between process parameters, geometrical and material behavior characteristics of the target and the resulting residual stress field. Reviews of the wide variety of numerical models developed since the first simulation proposed by Edberg et al (1995) can be found in Rouhaud et al (2005) and Sherafatnia et al (2016). Analytical models allow determining the stress distribution and the depth of the affected zone but finite element simulations provide a better understanding of the process enabling parametric studies.…”

Section: Introductionmentioning

confidence: 99%

Martensitic transformation induced by single shot peening in a metastable austenitic stainless steel 301LN: Experiments and numerical simulation

Guiheux

Berveiller

Kubler

et al. 2017

Journal of Materials Processing Technology

View full text Add to dashboard Cite

During conventional shot peening on metastable austenitic steels, martensitic transformation occurs in addition to plastic straining. In this work, the impact of a single spherical steel shot on a AISI 301LN steel was studied. The volume fraction of martensite, residual stresses in both phases were determined in the vicinity of the dent as a function of the shot velocity and diameter. An elasto-plastic two phase model that includes martensitic phase transformation was adapted to model mechanical and microstructural fields and implemented in Abaqus Explicit for the 2D simulation of a single shot impact. It was found, for instance, that the martensitic transformation takes place only under the dent and that martensite is in tension at the surface while austenite is in compression. Simulation results of stress levels showed a good agreement with experimental stresses determined by X-ray diffraction.

show abstract

Experimental measurement and analytical determination of shot peening residual stresses considering friction and real unloading behavior

Cited by 43 publications

References 20 publications

A Numerical Investigation of a Single-Shot in a DEM-FEM Approach to Shot Peening Simulation

A Numerical Investigation of a Single-Shot in a DEM-FEM Approach to Shot Peening Simulation

Literature review of numerical simulation and optimisation of the shot peening process

Martensitic transformation induced by single shot peening in a metastable austenitic stainless steel 301LN: Experiments and numerical simulation

Contact Info

Product

Resources

About